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Dave Ellis contact at madvase.co.ukHi Pau, Thanks for the help so far. I have tried using the kernel-gtp mode and only managed to cause crashes in the omso-ggsn program. I have updated to the latest git repository for the osmo-ggsn. I followed the instructions here https://osmocom.org/projects/openggsn/wiki/Kernel_GTP to load the kernel gtp module and the 'lsmod | grep gtp' shows the same as the results in the instructions. After that the instructions mention using openggsn. I'm not sure if there is further configuration required for the kernel gtp module - do I need to create a tunnel? Or should this be done by osmo-ggsn as it did for the gtpu-mode tun setting? [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". <0002> ggsn.c:203 APN(S1U): Starting <0002> ggsn.c:281 APN(S1U): Opening Kernel GTP device gtp0 <0002> gtp-kernel.c:75 Initialized GTP kernel mode (genl ID is 30) Program received signal SIGSEGV, Segmentation fault. gtp_kernel_init (gsn=0x0, devname=0x6a6fe0 "gtp0", prefix=prefix at entry=0x6a76e0, ipup=0x0) at gtp-kernel.c:94 94 if (gtp_dev_create(-1, devname, gsn->fd0, gsn->fd1u) < 0) { I have tried, without success, to find a sample config file with the kernel-gtp mode in for osmo-ggsn. Is there a sample config file for osmo-ggsn with the kernel-gtp mode selected? This is my current config file - I have gone through various attempts with different tun_device names. ! ! OpenGGSN (0.94.1-adac) configuration saved from vty !! ! ! kernel-gtp log stderr logging filter all 1 logging color 1 logging print category 0 logging timestamp 0 logging level ip info logging level tun info logging level ggsn info logging level sgsn notice logging level icmp6 notice logging level lglobal notice logging level llapd notice logging level linp notice logging level lmux notice logging level lmi notice logging level lmib notice logging level lsms notice logging level lctrl notice logging level lgtp info logging level lstats notice logging level lgsup notice logging level loap notice logging level lss7 notice logging level lsccp notice logging level lsua notice logging level lm3ua notice logging level lmgcp notice ! stats interval 5 ! line vty no login ! ggsn tun1 gtp state-dir /tmp gtp bind-ip 172.16.8.1 apn S1U gtpu-mode kernel-gtp tun-device gtp0 type-support v4 ip prefix dynamic 10.1.1.0/24 ip dns 0 192.168.100.1 ip dns 1 8.8.8.8 ip ifconfig 10.1.1.2/24 no shutdown default-apn S1U no shutdown ggsn Thanks Dave On Thu, Mar 29, 2018 at 3:14 PM, Pau Espin Pedrol <pespin at sysmocom.de> wrote: > Hi Dave, > > I never personally used it, but as far as I know you should be able to get > more performance by using "gtpu-mode kernel-gtp" instead of "gtpu-mode tun" > in your config, to avoid doing all packet processing in userspace. Please > someone else confirm this. I think you need a capable kernel and libgtpnl > to be able to use it. > > Also, it would be nice if you could provide a linux "perf" output on > osmo-ggsn while running your test setup so we can spot possible > optimizations to improve osmo-ggsn performance. > > -- > - Pau Espin Pedrol <pespin at sysmocom.de> http://www.sysmocom.de/ > ======================================================================= > * sysmocom - systems for mobile communications GmbH > * Alt-Moabit 93 > * 10559 Berlin, Germany > * Sitz / Registered office: Berlin, HRB 134158 B > * Geschaeftsfuehrer / Managing Director: Harald Welte > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-net-gprs/attachments/20180404/a467bbaa/attachment.htm>